Best Cold Air

I know this is getting to be a topic beaten into the ground, but what is the "best" cold air intake for a 5.3 Silverado? I have an 06 CrewCab 4x4 with a "functional" ram air hood, stock intake and custom exhaust. Shopping around, I'm finding K&N to be about $200 and some better than $500. Is the $500 better and giving more performance or are you paying extra just because they claim HP gains that you're not really going to see?

I have no problem paying top dollar, but kind of expect a better product in doing so. My main interest is to get that throaty sound when you romp on the gas and thrilled if I get a performance increase that's actually noticeable. Those expensive ones are claiming 20 HP+ at the wheels and I find that very hard to believe. I don't want to save money on the cheapo either and end up 100% disappointed! I'm not needing extra performance, but figure the truck looks the part and now it's time to have a little fun with it.

Thanks in advance for any advice!